﻿96 
  Dr. 
  R. 
  W. 
  Shiifeldt 
  on 
  

  

  41. 
  Ulna 
  proportionatelj 
  longer 
  41. 
  Ulna 
  proportionately 
  shorter 
  

   than 
  it 
  is 
  ia 
  the 
  Trochili 
  as 
  com- 
  than 
  it 
  is 
  in 
  the 
  Cypseli 
  as 
  com- 
  

   pared 
  with 
  the 
  humerus. 
  It 
  has 
  a 
  pared 
  with 
  the 
  humerus. 
  It 
  has 
  a 
  

   character 
  of 
  its 
  own, 
  not 
  especially 
  character 
  of 
  its 
  own, 
  not 
  especially 
  

   trochilidine. 
  cypseline. 
  

  

  42. 
  Badim 
  markedly 
  straight. 
  42. 
  liadius 
  markedly 
  bowed 
  or 
  

  

  curved. 
  

  

  43. 
  Carpo-metacarpus 
  very 
  stout 
  4.3. 
  Carpo-vutacarpus 
  propor- 
  

   in 
  proportion 
  ; 
  index 
  metacarpal 
  tionately 
  much 
  longer 
  than 
  in 
  the 
  

   longer 
  tlian 
  that 
  of 
  medius, 
  which 
  Swifts 
  ; 
  index 
  metacarpal 
  shorter 
  

   latter 
  is 
  curved 
  along 
  its 
  entire 
  than 
  that 
  of 
  medius, 
  which 
  latter 
  

   length. 
  is 
  straight 
  along 
  its 
  entire 
  length. 
  

  

  44. 
  Distal 
  joints 
  of 
  index 
  present 
  44. 
  Distal 
  joints 
  of 
  index 
  present 
  

   several 
  minor, 
  though 
  good 
  dilter- 
  several 
  minor, 
  though 
  good, 
  distin- 
  

   ential, 
  characters. 
  (See 
  jjlate 
  Ixi. 
  guishing 
  characters. 
  In 
  Micropus 
  

   P. 
  Z. 
  S. 
  1885.) 
  and 
  Trochilus, 
  for 
  example, 
  the 
  

  

  distal 
  joints 
  of 
  the 
  manus 
  are 
  mor- 
  

   phologically 
  strikingly 
  dissimilar. 
  

  

  There 
  are 
  two 
  or 
  three 
  sesamoidal 
  bones 
  to 
  be 
  found 
  in 
  the 
  

   arm 
  of 
  a 
  Humming-bird 
  that 
  do 
  not 
  occur 
  in 
  the 
  Swift; 
  but 
  

   that 
  is 
  a 
  small 
  matter 
  compared 
  with 
  the 
  many 
  and 
  absolute 
  

   differences 
  that 
  actually 
  exist 
  in 
  the 
  skeleton 
  of 
  the 
  pectoral 
  

   limb 
  in 
  representatives 
  of 
  these 
  two 
  suborders 
  of 
  birds. 
  

   Were 
  it 
  possible 
  to 
  have 
  the 
  skeleton 
  of 
  a 
  Humming-bird 
  as 
  

   large 
  as 
  the 
  skeleton 
  in 
  a 
  good-sized 
  Gull, 
  and 
  the 
  skeleton 
  

   of 
  a 
  typical 
  Swift 
  of 
  an 
  equal 
  size, 
  and 
  then 
  compare 
  them, 
  

   these 
  really 
  marked 
  differences 
  in 
  the 
  two 
  groups 
  would 
  at 
  

   once 
  be 
  apparent 
  to 
  the 
  eye. 
  So 
  far 
  as 
  those 
  differences 
  are 
  

   concerned 
  in 
  the 
  humerus 
  in 
  the 
  various 
  kinds 
  of 
  birds 
  of 
  

   which 
  we 
  have 
  been 
  speaking, 
  they 
  show 
  very 
  well 
  in 
  some 
  

   figures 
  which 
  I 
  published 
  in 
  the 
  ' 
  Proceedings 
  of 
  the 
  Zoolo- 
  

   gical 
  Society 
  of 
  London' 
  in 
  1886, 
  and 
  reproduce 
  here 
  in 
  

   order 
  to 
  better 
  illustrate 
  my 
  meaning. 
  

  

  In 
  both 
  Cypseli 
  and 
  Trochili 
  the 
  humerus 
  is 
  short, 
  but 
  

   so 
  far 
  as 
  proportionate 
  lengths 
  are 
  concerned 
  in 
  the 
  bra- 
  

   chium, 
  antibrachium, 
  and 
  manus 
  they 
  by 
  no 
  means 
  agree 
  

   in 
  the 
  representatives 
  of 
  the 
  two 
  suborders. 
  Be 
  this 
  as 
  it 
  

   may, 
  it 
  is 
  nothing 
  to 
  me 
  here, 
  for 
  I 
  am 
  now 
  dealing 
  

   with 
  charactei's, 
  and 
  not 
  attempting 
  to 
  solve 
  a 
  problem 
  in 
  

   arithmetic. 
  In 
  this 
  connection 
  it 
  is 
  worthy 
  of 
  mention, 
  

  

  